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A146713 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 21, 47, 295, 1465, 7767, 65051, 795933, 8973805, 164427495, 3016356659, 81769439115 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.0.0.0.0

.0.0.1.1.1.1.0.0

.0.0.0.1.0.0.1.1

.0.1.0.0.1.1.1.1

.1.1.1.1.0.0.1.0

.1.1.0.0.1.0.0.0

.0.0.1.1.1.1.0.0

.0.0.0.0.1.1.0.0

CROSSREFS

Sequence in context: A327302 A156966 A146705 * A140681 A262423 A020178

Adjacent sequences:  A146710 A146711 A146712 * A146714 A146715 A146716

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 20 08:28 EDT 2021. Contains 348099 sequences. (Running on oeis4.)